I'm going to LA next month to attend a conference. I went to South Korea in the past (for few days) and I didn't need to do anything. Except signing a couple of things at the airport before leaving (explaining why I'm staying how many days etc).
In LA I'm going to stay for about a week, and I've never been there. What do I need to do documentation wise, how do I get a visa?
PS: I'm flying from the UK and I'm an Italian citizen.